David Benton wrote:This is a video of a mans garden railway. It has 2 tracks running side by side , sharing the centre rail.
https://youtu.be/nvMgSqe0XW4?t=29" onclick="window.open(this.href);return false;
I'm just wondering if tis arrangement exists on the prototype anywhere in the world. I seem to recall it on a tramline somewhere.
I just remembered that the cable-car network in San Francisco has 3 examples. The northbound Powell-Mason and Powell-Hyde lines use the same trackage from the Market St. terminus to a point on Powell St. just south of Jackson, where the lines divide. Since the northbound direction is downhill at that point, the diversion must take place there even though both lines continue north on Powell and west on Jackson, splitting at Mason St., where Powell-Mason turns right. Since both lines are going uphill at this point, cars must grip the cable all the way from Powell St. without letting go. From the points on Powell St., where the trackage splits, the arrangement, facing north and reading from left to right, is as follows:
. left running rail of Hyde St. line
. slot over Hyde St. cable
. common running rail
. slot over Mason St. cable
. right running rail of Mason St. line
The whole works makes a 90-deg. left turn onto Jackson St.
At Mason St. the common rail splits, with one portion turning right to form the left running rail of the Mason St. line, and the other continuing straight on to form the right running rail of the Hyde St. line.
The other two instances are on Washington St. approaching Powell St., where out-of service cars turn north, downhill, on Powell, and cars in service or entering service turn south, uphill, on Powell; and on Hyde St. between just north of Jackson St. to Washington St., for California St. cars (from the cable car barn at Washington and Mason Sts.) going into service.